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LTC4075EDD Datasheet(PDF) 11 Page - Linear Technology |
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LTC4075EDD Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page LTC4075/LTC4075X 11 4075Xf The power supply status output (⎯P⎯W⎯R) has two states: pull- down and high impedance. The pull-down state indicates that power is present at either DCIN or USBIN. This output is strong enough to drive an LED. If no power is applied at either pin, the ⎯P⎯W⎯R pin is high impedance, indicating that the LTC4075 lacks sufficient power to charge the battery. The pull-down state is capable of sinking up to 10mA. The USB power status output (USBPWR) has two states: pull-down and high impedance. The high impedance state indicates that the LTC4075 is being powered from the USBIN input. The pull-down state indicates that the charger is either powered from DCIN or is in a UVLO condition (see Table 1). The pull-down state is capable of sinking up to 1mA. Thermal Limiting An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts to rise above a preset value of approximately 105°C. This feature protects the LTC4075 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the device. The charge current can be set according to typical (not worst-case) ambient temperature with the assurance that the charger will automatically reduce the current in worst- case conditions. DFN power considerations are discussed further in the Applications Information section. TRICKLE CHARGE MODE* 1/10th FULL CURRENT CHRG STATE: PULLDOWN SHUTDOWN MODE IUSBIN DROPS TO 18µA CHRG STATE: Hi-Z CHARGE MODE FULL CURRENT CHRG STATE: PULLDOWN CHARGE MODE FULL CURRENT CHRG STATE: PULLDOWN STANDBY MODE NO CHARGE CURRENT CHRG STATE: Hi-Z SHUTDOWN MODE IDCIN DROPS TO 20µA CHRG STATE: Hi-Z BAT > 2.9V BAT < 2.9V BAT < 2.9V 2.9V < BAT 2.9V < BAT BAT > 2.9V BAT < 4.1V BAT < 4.1V IBAT < ITERMINATE IN VOLTAGE MODE IBAT < ITERMINATE IN VOLTAGE MODE POWER SELECTION STANDBY MODE NO CHARGE CURRENT CHRG STATE: Hi-Z TRICKLE CHARGE MODE* 1/10th FULL CURRENT CHRG STATE: PULLDOWN ENABLE DRIVEN LOW ENABLE DRIVEN LOW ENABLE DRIVEN HIGH DCIN POWER REMOVED DCIN POWER REMOVED USBIN POWER REMOVED OR DCIN POWER APPLIED USBIN POWER REMOVED OR DCIN POWER APPLIED DCIN POWER APPLIED ONLY USB POWER APPLIED STARTUP 4075 F01 ENABLE DRIVEN HIGH *LTC4075 ONLY Figure 1. LTC4075 State Diagram of a Charge Cycle OPERATIO |
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